下列关于Serv-UFTP服务器配置的描述中,错误的是()。
A. Serv-UFTP服务器中的每个虚拟服务器由IP地址唯一识别
B. Serv-UFTP服务器中的最大用户数是指同时在线的用户数量
C. Serv-UFTP服务器最大上传或下载速度是指整个服务器占用的带宽
D. 配置服务器的域端口号时,既可使用端口21也可选择其他合适的端口号
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《植物检疫条例》规定,县级以上地方各级农业部门所属的植物检疫机构负责行使植物检疫权。此行为属于行政授权。()
A. 对
B. 错
允许用户在不切断电源的情况下,更换存在故障的硬盘、电源或板卡等部件的功能是()
A. 热插拔
B. 集群
C. 虚拟机
D. RAID
攻击者使用无效IP地址,利用TCP连接的三次握手过程,连续发送会话请求,使受害主机处于开放会话的请求之中,直至连接超时,最终因耗尽资源而停止响应。这种攻击被称为()。
A. DNS欺骗攻击
B. DDoS攻击
C. 重放攻击
D. SYN Flooding攻击
Amongst the most popular books written today are those which are usually classified as science fiction. Hundreds of titles are (1) every year and are read by all kinds of people. (2) , some of the most successful films of recent years have been (3) on science fiction stories.It is often thought that science fiction is a fairly new (4) in literature, but its ancestors can be (5) in books written hundreds of years ago. These books were often concerned (6) the presentation of some form of ideal society, a (7) which is still often found in modern stories.Most of the classics of science fiction, (8) , have been written within the last one hundred years. Books by writers such as Jules Verne and H. G. Wells, to (9) just two well-known authors, have been translated into many languages.Modern science fiction writers don’t write about men from Mars or space adventure stories. They are more interested in (10) the results of technical developments on society and the human mind; or in (11) future worlds which are a reflection of the world which we live in now. (12) this, their writing has obvious (13) implications.In an age where scientific fact frequently (14) science fiction, the writers may find it difficult to keep (15) scientific advances. Those who are (16) clear-sighted to see the way we are going, however, may provide a valuable (17) on how to deal with the problems which society will (18) face as it tries to (19) its new technology and come to terms with a continually (20) view of the world. 13()
A. economic
B. academic
C. political
D. literary